Here's the answer:
“こっちですか?”
(kocchi desu ka?)
Watch a real native speaker say it:
Here's how it sounds in a textbook:
Fun fact: the hundreds of thousands of people learning Japanese with Memrise get this phrase correct 88.48% of the time!
(kocchi desu ka?)
Fun fact: the hundreds of thousands of people learning Japanese with Memrise get this phrase correct 88.48% of the time!